Counting bubbles may not be the best way to measure the rate of photosynthesis. The volume of the bubbles is not always the same. Suggest and explain one alternative way of measuring the gas given off to solve this problem. ​​

How does the closing of the ductus arteriosus and ductus venosus alter circulation in an infant? a. increases blood flow to the pulmonary artery and increases blood flow to the umbilical vein b. increases blood flow to the pulmonary artery and reduces blood flow to the umbilical vein c. reduces blood flow to the pulmonary vein and increases blood flow to the umbilical artery d. reduces blood flow to the pulmonary vein and reduces blood flow to the umbilical artery